Study of fatigue crack characteristics by acoustic emission

Berkovits, A.; Fang, Daining

doi:10.1016/0013-7944(94)00274-l

Cited by 150 publications

(89 citation statements)

References 18 publications

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“…It is found that there is a very small plastic deformation that occurs prior to crack formation. The time domain AE signatures from the AE2T and AEPT groups show the difference in amplitudes and duration, due to the Bauschinger effect, occur at compressive peak stress (Berkovits & Fang, 1995). The similar shape of the time domain AE signatures from the AE2C and AEPB groups are due to the Bauschinger effect.…”

Section: Time Domain Ae Signatures Behaviourmentioning

confidence: 76%

“…Therefore, AE were generated due to the slip plane and microplastic deformation before the crack nucleated. AE activity at compressive peak stress is due to the Bauschinger effect, which is the phenomenon where AE are generated due to a change of strain direction (Berkovits & Fang, 1995 The fatigue mechanism can be divided into three different stages. During the first stage, cyclic softening occurred during the first cycle, which was then followed by cyclic hardening for several cycles.…”

Section: Ae Signatures and Fatigue Mechanismmentioning

confidence: 99%

“…Much of the AE generated at this stage is because of micro crack coalescence, fractures along grain boundaries, crack tip plastic deformation and also crack closure. The crack initiation phenomenon can be detected by a rapid increase of AE activity at positive peak stress during cyclic loading of Incoloy 901 (Berkovits & Fang, 1995). It was followed by AE activity with clear boundaries around zero stresses, which correspond to crack closure phenomena.…”

Section: Introductionmentioning

confidence: 96%

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Monitoring and Assessment of Acoustic Emission Signatures during Fatigue Mechanism of API5LX70 Gas Pipeline Steel

Fadhlan¹,

Kulthum²,

Abdullah³

et al. 2012

J MECH ENG SCI

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The detection of early fatigue phenomena in a gas pipeline is crucial in order to avoid catastrophic consequences. Therefore, appropriate inspection is needed to assess fatigue phenomena in a gas pipeline system. Acoustic emission (AE) technology is expected to be suitable in this regard. This paper presents the monitoring and assessment of AE signatures of the fatigue mechanism of gas pipeline material, API 5L X70 steel. The stress amplitude of 65%, 60%, 58% and 53% of the ultimate tensile strength were done in order to observe AE activity during the fatigue mechanism. Field measurements were also done by investigating AE signatures of an operational gas pipeline for comparison purposes. Based on the correlation of the AE signatures and fatigue mechanism, it was found that the AE activities generated during the fatigue mechanism were divided into three different stages. Analysis of the AE features and statistical parameters have shown that the kurtosis values of the time domain AE signatures from the third stage of the fatigue mechanism were different from the field measurements. This results show that the application of the kurtosis was expected to be able to detect the time domain AE signatures from the crack stage.

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Section: Time Domain Ae Signatures Behaviourmentioning

confidence: 76%

Section: Ae Signatures and Fatigue Mechanismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

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Monitoring and Assessment of Acoustic Emission Signatures during Fatigue Mechanism of API5LX70 Gas Pipeline Steel

Fadhlan¹,

Kulthum²,

Abdullah³

et al. 2012

J MECH ENG SCI

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“…Acoustic emission is defined as a transient elastic wave generated by the rapid release of energy within a material and an AE signal is the electrical signal produced by a sensor in response to this wave [16,17]. The use of AE has been primarily limited to statistical analysis of AE hits.…”

Section: The Basic Theory Of Aementioning

confidence: 99%

A Probabilistic Approach to Small Fatigue Crack Initiation and Sizing Using Acoustic Emission

Keshtgar

Modarres

2017

Preprint

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Abstract:One of the major concerns in structural health management (SHM) is the early detection of a growing crack. Using this, future damage due to crack propagation can be mitigated or eliminated by implementing proper repair and maintenance. Acoustic Emission (AE) is a non-destructive testing (NDT) method with potential applications for locating and monitoring fatigue cracks. The research presented in this paper focuses on SHM using AE. A novel AE signal analysis approach was proposed in order to detect crack initiation and assess small crack lengths. Experimental investigation indicated that initiation of a crack could be identified through the statistical analysis of the resulting features of the AE signals. A probabilistic AE-based model for small fatigue crack sizing was developed and the uncertainties of the model were estimated. In addition, a probabilistic model validation approach was implemented to confirm accurate estimation of the results. The outcome of this research can be used to evaluate the integrity of structures under fatigue loading. The proposed approach can also be applied as an approach to manage health and assess prognosis of structures.

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“…Even nowadays, the popularity of the reinforced concrete structure applications has been maintained as a major and minor construction [1]- [4]. Upon to that matter, it has been facing several types of damages mechanisms and deteriorations during their service life.…”

Section: Introductionmentioning

confidence: 99%

Intensity Analysis Method for Measurement the Damage Severity of Concrete Structure by Utilizing the Acoustic Emission Technique

Shahidan¹,

Bunnori²,

Bhardwaj³

et al. 2012

IJAPM

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Abstract-Evaluation methods such as acoustic emission (AE) are required for assessing the deterioration on concrete structures. This paper gives a brief on the evaluations of the acoustic emission to the health monitoring of reinforced concrete structure beam. Small scale size beam have been used for this investigation and the AE signal processing are the main principal data in this work for assessing by using the statistical technique, which is known as intensity analysis method (IA). This technique is capable to quantify and evaluate the damage severity on concrete structures. Eventually, by using the AE signal strength data, the results indicates are greater instruments in determining the damage mechanism level on concretes structure.Index Terms-Acoustic emission, intensity analysis, historical index, severity index.

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Study of fatigue crack characteristics by acoustic emission

Cited by 150 publications

References 18 publications

Monitoring and Assessment of Acoustic Emission Signatures during Fatigue Mechanism of API5LX70 Gas Pipeline Steel

Monitoring and Assessment of Acoustic Emission Signatures during Fatigue Mechanism of API5LX70 Gas Pipeline Steel

A Probabilistic Approach to Small Fatigue Crack Initiation and Sizing Using Acoustic Emission

Intensity Analysis Method for Measurement the Damage Severity of Concrete Structure by Utilizing the Acoustic Emission Technique

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